# Relationship history for MSHA mine 3301490

Current hierarchy: **Michael  Hollingshead → SRM Materials, LLC → Sidley-Kingsville Pit R W Sidley Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Robert C  Sidley et al → Sidley-Kingsville Pit R W Sidley Inc; 1950-01-01 to 2022-11-24; source msha-controller-operator-history
- **operator_operates_mine:** R W Sidley Inc → Sidley-Kingsville Pit R W Sidley Inc; 1977-10-01 to 2024-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Sidley et al → R W Sidley Inc; 1977-10-01 to 2022-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Hollingshead et al → Sidley-Kingsville Pit R W Sidley Inc; 2013-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Buescher → Sidley-Kingsville Pit R W Sidley Inc; 2022-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Buescher → R W Sidley Inc; 2022-11-25 to 2024-01-29; source msha-controller-operator-history
- **operator_operates_mine:** SRM Materials, LLC → Sidley-Kingsville Pit R W Sidley Inc; 2024-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Hollingshead et al → SRM Materials, LLC; 2024-01-30 to current/open; source msha-controller-operator-history